Feed-controlling device



(5.4H. GILMAN.

FEED CONTHOLLING DEVICE.

APPLICATION FILED 050.10, 1917.

Patented Dec. 21, 1920.

UNITED STATES PATENT OFFICE.

GEORG-E H. GILMAN, OF CLAREMONT, NEW `HAMPSHIR, ASSIGNOR TO SULLIVAN MACHINERY COMPANY, A CORPORATION F MASSACHUSETTS FEED-lCONTROLLING DEVICE.

To all wlw/m it may concern.'

Be it known that I, GEORGE H. GILMAN, a

I citizen of the United States, residing at Claremont State of ew Hampshire` have invented certain new and useful Improvements in Feed-Controlling Devices, of which the following `is a full, clear, and exact specification.'

My invention relates to feed controlling devices. i

In. my previous, Patent, No. 1,151,261, I have described and claimed an improved feedingmeans especially adapted to use in connection with percussive tools, wherein a braking or retardingdevice in the form of a resilient member is providedto act upon one of the feeding elements. My present invention has for its object to provide an improved feeding device of the type set forth, wherein, through an improved combinationA including intermediate connections between the resilient member and the feeding element, the feeding operation is ren dered more smooth and any difiiculty arising from occasional sticking of the same is entirely overcome. I

In the accompanying drawings, I have shown for purposes of illustration one embodiment which my invention may assume in practice., y A

Inv these drawings,-

Figure 1 is a side elevation of a feeding mechanism equipped with my improvement, the feed cylinderand retarding mechanism being shown in section to facilitate illustration. i

Fig. 2 is an enlarged longitudinal sectional view ofthe retarding mechanism in position relative to the feeding element.

Fig. 3 is a transverse sectional view, with parts broken away, showing the controlling or retarding mec anism.

Fig. 4 is a detail perspective view, par'- tially broken away, of the braking means per se and its housing.

Fig. 5 is an end elevation of the construction shown in Fig. 4.

Fig. 6 is a side elevation of the same.

in the county of Sullivan and,

Specification of Letters Patent. Patented Dec 21 1920 Application led December 1Q, 1917. Serial No. 206,468.

be employed, in this illustrative construc- `tion I have shown a feeding mechanism including a feed cylinder 1 adapted to be clamped byany suitable clamp 2 to a sup port 3 and having therein a 'moving feed piston 4 provided with a piston rod 5. This rod 5, as shown, has swiveled on its outer end a swinging support or bracket 6 which in ti iin supports a percussive tool 7, herein shown in the form of a hammer drill. In this construction, as in a usual construction, changes in the position of the piston 4 in the cylinder, and therefore in the position of this tool 7, are produced by fluid pressure through the manipulation of a suitable tool and feed controlling valve 8, herein located on the support 6 and controlling the supply of air from any suitable source through passage-ways 9 and 10 leading through the rod 5 to the opposite sides of the piston 4. As in my previous construction, it will also be observed that upon the front head 11 of the cylinder 1, I have provided a braking or feed restraining means including a rotatable worm 12, a worm gear 13 engaged by said worin and disposed concentrically with the piston rod, and a coiled member 15 constituting an'elastic feed restraining or brake applying member. Said brake applying member is in the forni of a coiled spring surrounding the piston rod,

.and one end 14 of said member 15 is engaged with and slidable longitudinally in a slot in the worm-gear 13, while the other end 16 is attached to the head 11.

In my improved construction, it will be observed that disposed between the spring- 15 and the piston rod 5 and around the latter, is a brake lining 17. In a preferred form, this lining'is made of a well known fiber composition adapted to exert a powerful braking effect and yet to withstand wear. As shown, this brake lining is'divided into coperating portions, herein shown in the form of halves, disposed on opposite sides of the rod 5 and carried in a resilient two-part metallic housing or ,casing 18, 19, the lining being inset in a' suitable internal groove in the inner periphery of each part and disposed substantially fiush with the inner periphery thereof. The two parts 18 and 19 of this housing are, in turn,

preferably so disposed as to leave a longitudinally dlsposed gap extending between the adjacent edges of each part, and each of the same is also preferably provided with a series of longitudinally disposed slots 21 oppositely disposed or staggered and each exwith the piston rod 5 in accordance with the variations in the supply of pressure fluid brou ht about by adjustment of the member -8. he movement of the piston rod 5 will,

moreover, alsofbe controlled, asl in my previous construction, by manlpulation ofthe member 12. In my improved construction,

however, it will. be observed that the rotation of this member and its connected worm and worm gear does not cause the spring 15 to act directly upon the piston rod, the same instead acting through the live or active intermediate braking member; `More specilically, it will be observed that the movement of these members toward braking position causes the spring to be contracted about the two-part member 18, 19 in such a manner as to contract the latter and thus cause the brake lining 17 to engage the surfaceof the piston rod 5. Obviously, due to the\construction of the members 18 and 19, it will also be observed that the resiliency of these members will assist in producing-a relatively even application of the retarding effect upon the surface of the rod 5. Further, when the controlling members are released. these members 18 and 19 will also then act gradually and surely to release the piston member 5, the same again returning to their normal configurations and carrying the brake lining 17 ywith,them. In fact, it'has been found that whatever the operation of the controlling mechanism 12, 13, 15, through the utilization of my improved live braking unit not only is the retarding influence rendered entirely even, but the release of the parts is also of such a character as to avoid any tendency whatsoever toward jamming of the feed as has occasionally occurred heretofore under certain conditions.

As a result of my improvement, it will also be observed that a construction is produced which, while greatly improving the operation of the device under certain conditions, may nevertheless be manufactured at.

small expense and applied to existingdevices without extensive redesign. It will also be noted that due to the provision of my improved elements 18 and 19, and their brake lining 17 a construction is produced having greatly increased wearing qualities, practically the entire wear being taken upon the brake lining, which is readily replaceable, or upon the surfaces of the members 18 and 19, which are likewise readily replaceable when desired, although the wear on these elements is so small as to render replacementsy ordinarily unnecessary. These and other advantages of my improved construction will, however, be clearly apparent to those skilled in the art.

While I have in this application specifically described one embodiment which my invention may assume in practice, it will be understood that this form of the same is used for illustrative purposes only and that the invention may be modified and embodied in various other forms without departing from its spirit 'or the scope of the appended claims. v

What I claim as new'and'desire to secure by Letters Patent is:

1. In` combination with a feedin mechanism having a longitudinally movale member, a controlling mechanism comprising an elastic feed restraining memberl surrounding said first mentioned'member, and an active braking member freely disposed oetween said restraining member ands'aid longitudinally movable member.

2. In combination with a feeding mechanism having a longitudinally movable member, a controlling mechanism including an elastic feed restraining member surrounding said longitudinally movable member, and a resilient braking member disposed between said restraining member and said longitudinally movable member. Y

3. In combination with a feeding mechanism having a longitudinally movable member, a controlling mechanism including an elastic feed restraining member surrounding said longitudinally movable member,jand an ,expansible and'contractible braking member disposed between said restraining member and said longitudinally movable member.

4. In combination with a feeding mechanism having a longitudinally movable mem-` ber, controlling mechanism including an elastic feed restraining membersurrounding said longitudinally movable member,and a plural-part resilient braking member disposed between said restraining member and said longitudinally movable member.

5. In combination with a feedingmechanism having a longitudinally movable member, a controlling mechanism including an elastic f eed restraining member surrounding said longitudinally, movable member, a brake lining disposed between the same and a part of said feeding mechanism, and a container housin said brake lining. 6. In combination with a feeding mechaber, a controlling mechanism comprising a relatively stationary elastic feed restraining member. surrounding said first mentioned member and spaced therefrom, and'a separate brake member disposed in sald space. l

7. In combination with a feeding mechanismhaving a longitudinally movable member, a controlling mechanism comprising a relatively stationary elastic feed restraining member surrounding said first mentloned member and spaced therefrom, and a brake member disposed in said space and unconnected with said other members.

8. Incombination with a feeding mechanism having a longitudinally movable member, a controlling mechanism compr1s1ng an elastic member surrounding saidlongitudinally movable member and spaced therefrom by a relatively annular space, a brake member normally loosely occupying said space, and means for placing said elastic member under constraint to reduce said space and compress said brake member closely around said first mentioned member.

9. In an apparatus of the character described, the combination including feeding mechanism, controlling mechanism therefor including an elastic feed restraining member, a brake lining disposed between the same and a part of saidfeeding mechanism, and a resilient container housing said brake lining; f

10. In an apparatus of the character described, the combination including feeding mechanism, controlling mechanism therefor including an elastic feed restraining member, a plural part brake lining disposed b etween the same and a part of said feeding mechanism, and a resilient container housing said brake lining.

ll. In an apparatus of the character described, the combination including feeding mechanism, controlling mechanism therefor including an elastic feed restraining member, a plural part brake lining disposed between the same andra part of said feeding mechanism, and a plural part resilient con- Jgainer housing said brake lining.

l2. In an apparatus of the character described, the combination including feeding mechanism, feed controlling mechanism including a spring disposed around one of the elements thereof, a resilient housing means disposed within said spring, and a brake lining disposed withinsaid housing.

13. In an apparatus of the character described, the combination including feeding mechanism, feed controlling mechanism including acoiled spring disposed around one of the elements of the same, a longitudinally slotted housing disposed within said spring, and a brake lining disposed between said housing and said feeding element.

14. In an apparatus of the character described, the combinationincluding feeding mechanism, controlling means therefor in,

cluding a coiled spring disposed around one of the elements thereof, aftwo-part resilient housing means disposed within said spring,` and a brake linin carried in each of said parts and engagea le with said element.

15. In an apparatus of the character described, the combination including feeding mechanism including a reciprocable member, feed controlling mechanism including a coiled spring disposed around said member, a two-part metallic housing having oppositely disposed longit'udinal slots in each of its parts, and a brake lining carried by each ,of said parts and engageable with said reciprocable member.

eoA

16. In an apparatus of the character dey scribed, the combination including feeding mechanlsm havmg a longitudinally movable element, controlling mechanism therefor including an elastic feed restraining member surrounding said element, and a non-rotative braking member disposed between said restraining member and said element.

17. In an apparatus of the character described, the combination including feeding mechanism having a longitudinally movable element, controlling mechanism therefor including an elastic feed restraining member 4surrounding said element, and a braking member disposed between said restraining member and said element and engageable with the latter.

18. In an apparatus of the character described, the combination including feeding mechanism having a longitudinally movable element, controlling mechanism therefor` including an elastic feed restraining member surrounding said element, and a braking member disposed between said restraining member and said element, said braking member having a frictional engagement with said element.

19. In an apparatus of the character described, the combination including feeding mechanism, a head thereon, controlling mechanism therefor including an elastic feed restraining member, anda braking member loosely disposed between said restraining member and a part of said feeding mechanism and adapted to engage said restraining member and part and said head.

20. In an apparatus of the character described, the combination'including feeding mechanism, a head thereon, controlling mechanism therefor including an elastic feed restraining member, and a braking member loosely disposed between said restraining member and a part of said feeding mechanism and adapted to engage said restraining member and part and said headv to transfer the restraining force of the frictional engagement to said head.

2l. In an apparatus of the character described, the ,combination including feeding mechanism, controlling mechanism therefor including an elastic feed restraiping mem- 5 ber surrounding a. art of said feeding mechanisrxl,l a brake lining freely disposed between the restraining member and said pari of said feeding mechanism5 and an elas ic container housing said brake lining, said brake lining and container being slotted 10 lorgitudinallyalternateb7 on opposite sides.

n tesimony whereof 'affix my signature.

GEORGE'H. GILMAN. 

